[R] Roots of quadratic system.
Bill.Venables@csiro.au
Bill.Venables at csiro.au
Mon May 2 02:20:11 CEST 2005
Are you looking for a unique solution or families of solutions?
Can't you turn a root-finding problem for a system of equations
with a unique solution into an optimisation problem, anyway?
E.g. You want to solve
f1(x) = g1
f2(x) = g2
...
Why not optimise L(x) = (f1(x) - g1)^2 + (f2(x) - g2)^2 + ...
with respect to x? If the minimum value is zero, then you are
done; if it is greater than zero your original system does not
have a solution.
If you are in the complex domain the changes needed are obvious.
V.
: -----Original Message-----
: From: r-help-bounces at stat.math.ethz.ch
: [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of John Janmaat
: Sent: Monday, 2 May 2005 12:48 AM
: To: r-help at stat.math.ethz.ch
: Subject: [R] Roots of quadratic system.
:
:
: Hello,
:
: I have a system of quadratic equations (results of a
: Hamiltonian optimization)
: which I need to find the roots for. Is there a package
: and/or function which
: will find the roots for a quadratic system? Note that I am
: not opimizing, but
: rather solving the first order conditions which come from a
: Hamiltonian. I am
: basically looking for something in R that will do the same
: thing as fsolve in
: Matlab.
:
: Thanks,
:
: John.
:
: ==============================================
: Dr. John Janmaat
: Department of Economics
: Acadia University
: Tel: 902-585-1461
:
: ______________________________________________
: R-help at stat.math.ethz.ch mailing list
: https://stat.ethz.ch/mailman/listinfo/r-help
: PLEASE do read the posting guide!
: http://www.R-project.org/posting-guide.html
:
More information about the R-help
mailing list